Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at act.a(SourceFile:1351)
	at act.g(SourceFile:1329)

---- Minecraft Crash Report ----
// There are four lights!

Time: 06.09.13 15:10
Description: Ticking entity

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at act.a(SourceFile:1351)
	at act.g(SourceFile:1329)
	at act.h(SourceFile:1236)
	at avx.m(SourceFile:1426)
	at avx.V(SourceFile:686)
	at avx.e(SourceFile:642)
	at net.minecraft.client.main.Main.main(SourceFile:103)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at act.a(SourceFile:1351)
	at act.g(SourceFile:1329)

-- Entity being ticked --
Details:
	Entity Type: Cow (sg)
	Entity ID: 98869
	Entity Name: Cow
	Entity's Exact location: -567,50, 71,00, -768,50
	Entity's Block location: World: (-568,71,-769), Chunk: (at 8,4,15 in -36,-49; contains blocks -576,0,-784 to -561,255,-769), Region: (-2,-2; contains chunks -64,-64 to -33,-33, blocks -1024,0,-1024 to -513,255,-513)
	Entity's Momentum: 0,00, 0,00, 0,00
Stacktrace:
	at act.h(SourceFile:1236)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfg['DerMCy'/313, l='MpServer', x=-567,80, y=72,62, z=-768,91]]
	Chunk stats: MultiplayerChunkCache: 321, 321
	Level seed: 0
	Level generator: ID 03 - amplified, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (252,64,248), Chunk: (at 12,4,8 in 15,15; contains blocks 240,0,240 to 255,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 56753 game time, 43579 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 116 total; [tj['item.item.slimeball'/96129, l='MpServer', x=-522,84, y=60,13, z=-729,63], sl['Mooshroom'/42268, l='MpServer', x=-570,94, y=64,00, z=-811,94], tw['Creeper'/83665, l='MpServer', x=-543,85, y=56,38, z=-767,85], sd['Bat'/97138, l='MpServer', x=-611,91, y=18,46, z=-710,13], un['Zombie'/98607, l='MpServer', x=-575,50, y=14,00, z=-772,50], sd['Bat'/98593, l='MpServer', x=-644,44, y=43,06, z=-709,77], sl['Mooshroom'/41812, l='MpServer', x=-571,22, y=64,00, z=-814,69], sd['Bat'/98618, l='MpServer', x=-490,25, y=41,10, z=-751,34], tw['Creeper'/89966, l='MpServer', x=-615,50, y=64,00, z=-804,50], un['Zombie'/98608, l='MpServer', x=-574,50, y=14,00, z=-769,50], un['Zombie'/97540, l='MpServer', x=-540,50, y=50,00, z=-850,50], tw['Creeper'/98611, l='MpServer', x=-639,50, y=70,00, z=-821,50], tj['item.tile.mushroom'/95217, l='MpServer', x=-581,25, y=64,13, z=-774,69], tj['item.tile.stonebrick'/95119, l='MpServer', x=-584,22, y=64,13, z=-774,91], sd['Bat'/98132, l='MpServer', x=-494,19, y=21,49, z=-769,79], uk['Spider'/97639, l='MpServer', x=-500,81, y=15,00, z=-814,22], sm['Cat'/96533, l='MpServer', x=-564,34, y=-12426,29, z=-768,31], tj['item.tile.dirt.default'/95145, l='MpServer', x=-584,19, y=64,13, z=-774,94], sg['Cow'/45601, l='MpServer', x=-570,19, y=71,00, z=-779,19], op['Experience Orb'/84084, l='MpServer', x=-577,56, y=71,25, z=-779,47], sr['Squid'/98150, l='MpServer', x=-606,69, y=61,78, z=-809,91], ui['Skeleton'/97717, l='MpServer', x=-494,50, y=69,00, z=-780,50], sd['Bat'/98703, l='MpServer', x=-592,00, y=12,84, z=-691,38], sl['Mooshroom'/42922, l='MpServer', x=-561,31, y=64,00, z=-805,88], ui['Skeleton'/98715, l='MpServer', x=-607,50, y=33,00, z=-711,50], ui['Skeleton'/98714, l='MpServer', x=-611,50, y=33,00, z=-710,50], un['Zombie'/98713, l='MpServer', x=-612,50, y=33,00, z=-716,50], tw['Creeper'/97709, l='MpServer', x=-643,50, y=29,00, z=-703,50], ui['Skeleton'/98719, l='MpServer', x=-571,50, y=25,00, z=-776,50], ui['Skeleton'/98718, l='MpServer', x=-569,50, y=25,00, z=-774,50], ui['Skeleton'/98716, l='MpServer', x=-609,50, y=33,00, z=-718,50], uk['Spider'/98230, l='MpServer', x=-592,06, y=70,81, z=-781,07], sm['Cat'/76370, l='MpServer', x=-564,69, y=-17172,76, z=-768,31], tj['item.tile.dirt.default'/84156, l='MpServer', x=-581,81, y=70,13, z=-780,75], tj['item.tile.dirt.default'/84153, l='MpServer', x=-578,16, y=70,13, z=-778,81], ui['Skeleton'/98747, l='MpServer', x=-554,09, y=62,28, z=-792,31], tj['item.tile.dirt.default'/91653, l='MpServer', x=-589,72, y=70,13, z=-775,34], un['Zombie'/98758, l='MpServer', x=-567,50, y=64,00, z=-821,50], tj['item.item.slimeball'/98262, l='MpServer', x=-565,22, y=61,13, z=-721,09], tj['item.tile.dirt.default'/90133, l='MpServer', x=-587,84, y=67,13, z=-768,22], uk['Spider'/98753, l='MpServer', x=-496,50, y=69,00, z=-770,50], tj['item.item.slimeball'/95597, l='MpServer', x=-628,44, y=62,13, z=-767,59], tj['item.tile.stonebrick'/90141, l='MpServer', x=-586,81, y=65,13, z=-776,72], tw['Creeper'/93929, l='MpServer', x=-551,38, y=64,00, z=-761,09], tj['item.tile.stonebrick'/90136, l='MpServer', x=-584,81, y=63,13, z=-773,81], un['Zombie'/93931, l='MpServer', x=-551,56, y=62,34, z=-796,63], tj['item.tile.dirt.default'/84167, l='MpServer', x=-579,19, y=70,13, z=-779,78], ui['Skeleton'/98243, l='MpServer', x=-528,50, y=25,00, z=-767,50], sd['Bat'/97748, l='MpServer', x=-487,53, y=41,10, z=-753,25], sd['Bat'/98798, l='MpServer', x=-608,38, y=37,00, z=-806,93], uj['Dinnerbone'/95555, l='MpServer', x=-568,69, y=71,05, z=-772,69], uj['Dinnerbone'/95556, l='MpServer', x=-568,69, y=70,60, z=-772,69], sm['Cat'/95557, l='MpServer', x=-568,69, y=70,00, z=-772,69], tj['item.tile.dirt.default'/90145, l='MpServer', x=-586,31, y=64,13, z=-773,34], ui['Skeleton'/97324, l='MpServer', x=-596,59, y=67,00, z=-786,88], sg['Cow'/98869, l='MpServer', x=-567,50, y=71,00, z=-768,50], sm['Cat'/75583, l='MpServer', x=-564,50, y=-51096,47, z=-768,56], sg['Cow'/46374, l='MpServer', x=-557,44, y=65,00, z=-799,72], uj['Slime'/97333, l='MpServer', x=-622,78, y=61,00, z=-765,22], tj['item.tile.dirt.default'/87253, l='MpServer', x=-577,69, y=68,13, z=-776,88], uj['Slime'/98834, l='MpServer', x=-522,68, y=64,00, z=-695,63], sd['Bat'/87233, l='MpServer', x=-487,25, y=41,10, z=-753,25], tj['item.item.slimeball'/96891, l='MpServer', x=-552,81, y=60,13, z=-794,28], un['Zombie'/98390, l='MpServer', x=-641,78, y=63,00, z=-798,13], bfg['DerMCy'/313, l='MpServer', x=-567,80, y=72,62, z=-768,91], tj['item.tile.dirt.default'/88669, l='MpServer', x=-582,13, y=68,13, z=-766,19], sl['Mooshroom'/42078, l='MpServer', x=-550,22, y=63,00, z=-803,72], tj['item.tile.dirt.default'/88671, l='MpServer', x=-580,59, y=67,13, z=-766,91], tj['item.tile.dirt.default'/88677, l='MpServer', x=-578,09, y=71,13, z=-768,00], sm['Cat'/46966, l='MpServer', x=-564,31, y=-52544,19, z=-768,31], so['Sheep'/381, l='MpServer', x=-562,97, y=64,00, z=-693,84], so['Sheep'/380, l='MpServer', x=-565,72, y=64,00, z=-695,88], so['Sheep'/382, l='MpServer', x=-566,56, y=64,00, z=-692,53], tj['item.item.slimeball'/83854, l='MpServer', x=-616,34, y=62,13, z=-757,22], so['Sheep'/377, l='MpServer', x=-577,91, y=64,00, z=-817,94], so['Sheep'/376, l='MpServer', x=-561,88, y=64,00, z=-807,88], so['Sheep'/379, l='MpServer', x=-566,88, y=64,00, z=-696,47], so['Sheep'/378, l='MpServer', x=-621,75, y=64,00, z=-773,47], un['Zombie'/98414, l='MpServer', x=-578,00, y=65,00, z=-803,44], un['Zombie'/98408, l='MpServer', x=-640,50, y=29,00, z=-766,50], so['Sheep'/364, l='MpServer', x=-584,22, y=64,00, z=-808,66], so['Sheep'/361, l='MpServer', x=-591,50, y=66,00, z=-747,25], so['Sheep'/362, l='MpServer', x=-598,91, y=69,00, z=-779,41], un['Zombie'/98400, l='MpServer', x=-547,50, y=50,00, z=-847,50], so['Sheep'/363, l='MpServer', x=-608,50, y=63,00, z=-751,25], so['Sheep'/411, l='MpServer', x=-540,19, y=63,00, z=-765,47], so['Sheep'/414, l='MpServer', x=-537,50, y=65,00, z=-732,50], tx['Enderman'/98455, l='MpServer', x=-563,06, y=66,00, z=-799,53], so['Sheep'/412, l='MpServer', x=-539,03, y=65,00, z=-732,88], so['Sheep'/413, l='MpServer', x=-536,41, y=65,00, z=-737,16], tw['Creeper'/98461, l='MpServer', x=-578,50, y=63,00, z=-838,50], tj['item.tile.stonebrick'/94114, l='MpServer', x=-581,94, y=64,13, z=-774,59], tj['item.tile.stonebrick'/94112, l='MpServer', x=-581,78, y=65,13, z=-776,59], tj['item.tile.stonebrick'/94113, l='MpServer', x=-581,22, y=64,13, z=-774,50], ui['Skeleton'/98442, l='MpServer', x=-507,50, y=63,00, z=-803,50], tw['Creeper'/98443, l='MpServer', x=-507,50, y=63,00, z=-804,50], tj['item.tile.stonebrick'/94105, l='MpServer', x=-584,94, y=64,13, z=-771,88], so['Sheep'/433, l='MpServer', x=-503,31, y=63,00, z=-841,75], tj['item.tile.stonebrick'/94104, l='MpServer', x=-586,19, y=64,13, z=-773,69], so['Sheep'/434, l='MpServer', x=-505,16, y=64,00, z=-822,38], tj['item.tile.stonebrick'/94107, l='MpServer', x=-583,84, y=63,13, z=-773,00], tj['item.tile.stonebrick'/94109, l='MpServer', x=-582,59, y=64,13, z=-773,41], tj['item.tile.stonebrick'/94110, l='MpServer', x=-582,38, y=64,13, z=-772,19], un['Zombie'/98522, l='MpServer', x=-538,97, y=57,00, z=-774,53], sd['Bat'/98500, l='MpServer', x=-522,52, y=45,48, z=-775,57], sd['Bat'/98501, l='MpServer', x=-510,79, y=46,76, z=-779,64], so['Sheep'/457, l='MpServer', x=-508,47, y=62,00, z=-771,66], tw['Creeper'/97531, l='MpServer', x=-550,84, y=64,00, z=-747,09], sd['Bat'/98550, l='MpServer', x=-527,76, y=50,68, z=-778,46], sm['Cat'/98019, l='MpServer', x=-564,34, y=-4633,91, z=-768,31], tw['Creeper'/96928, l='MpServer', x=-612,50, y=65,00, z=-784,50], sd['Bat'/98555, l='MpServer', x=-647,38, y=34,18, z=-788,94], tj['item.item.feather'/95307, l='MpServer', x=-569,25, y=71,13, z=-781,34], uk['Spider'/98530, l='MpServer', x=-511,50, y=33,00, z=-795,50], uk['Spider'/98529, l='MpServer', x=-511,25, y=33,00, z=-801,28], tj['item.item.chickenRaw'/95309, l='MpServer', x=-569,28, y=71,13, z=-781,41]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bfb.a(SourceFile:285)
	at avx.b(SourceFile:1813)
	at avx.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36a
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 289665616 bytes (276 MB) / 535298048 bytes (510 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 3411 (191016 bytes; 0 MB) allocated, 1434 (80304 bytes; 0 MB) used
	Suspicious classes: [com.ibm.icu.text.ArabicShapingException], [gnu.trove.TIntCollection], [gnu.trove.impl.HashFunctions, PrimeFinder], [gnu.trove.impl.hash.THash, TPrimitiveHash, TIntIntHash], [gnu.trove.iterator.TIterator, TAdvancingIterator, TIntIntIterator], [gnu.trove.map.TIntIntMap], [gnu.trove.map.hash.TIntIntHashMap], [gnu.trove.procedure.TIntIntProcedure], [gnu.trove.set.TIntSet]
	IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
	Launched Version: 13w36a
	LWJGL: 2.9.0
	OpenGL: ATI Mobility Radeon HD 4500/5100 Series GL version 3.3.11672 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 515 (28840 bytes; 0 MB) allocated, 465 (26040 bytes; 0 MB) used